Deep-well pump



June 24, 1930 E. s. GRAFENsTATT 1,767,879

DEEP WELL PUMP Filed March 1o, 192e 5 sheets-sheet 1 3 Sheets-Sheet 2 y INVENTOR. EmiS @mfnstatt E. S. GRAFENSTATT DEEP WELL PUMP Filed March 10, 1926 June 24, 1930,

June 24, 1930. E. s. GRAFENSTATT y 1,767,879

DEEP WELL PUMP Filed March l0, 1926 3 Sheets-Sheet 5 IN VEN TOR.

` Emll Grafens'fat BY V Patented .lune 24, 1930 EMIL S. GRAFENSTATT, F LOS ANGELES, CALIFORNIA DEEP-WELL PUMP Application led March 10, 1926. Serial No. 93,576.

This invention relates to deep well pumps such as used for raising oil or water.

It is common practice to employ a reciprocating pump rod operated from the mouth of the well and carrying a plungerat the level of the oil at the bottom of the well. In deep wells, the weight of this pump rod is considerable and causes a considerable elongation of the rod in the up-stroke of the plunger. This 4detracts from the efficiency of the pump and is one of the objections inherent in pumps of that type.

It has been attempted to avoid the use of reciprocating pump rods in deep wells .by f employing pumps operating on the air-lift principle but the objection to pumps of that type is that if the well is verydeep, the air or gas used for producing the air lift must be at a relatively high pressure, and in the use of the high pressure air, there is a tendency for the suction developed at the foot of the flow pipe to cause an inflow of the oil sand into the casing. The general object of this invention is to overcome these difliculties and to provide a pump of simple construction which can be placed at a low level in the well casing and which will be operated automatically through the agency of fluid or liquid under pressure. Such pressure may be maintained in the casing, that is to say in the space surrounding the flow-pipe. One of the objects of the invention is to produce a pump of this type which will operate to raise the water or oil on both strokes of the pump.

Another object is to provide a deep well pump employing but one pipe within the well casing for embracing the pump and control valve mechanisms.

Another object is to provide a device in which only a single valve is necessary to control the operation of the pump.

A further object is to provide a deep Well pump including a tubular plunger having a power head, and carrying a check valve,

together with a fixed sleeve within the pump v barrel which telescopes within the plunger, and an assembly so designed that the velocity of the column from the well toward the pump, and the velocity of the column from the pump toward the outlet will be the same on the up and down strokes of the plunger.

A still further object is to provide a pump including a control valve which will at no time stop or retard the movement of oil from the well toward the outlet.

A further object is to provide a pump mechanism so arranged that a renewal of the check valve in the upper end of the barrel, and also of the check valve carried on the plunger will be leffected without disturbing the position of the barrel in the well.

A still further object is to provide a'pump whereby the fluid from the well may pass through the pump without coming in direct contact with the power head or the walls of the pump cylinder.

Another object is to provide a pump in which the mechanism is so arranged that a reversal of the control valve position may be initiated at points near the completion of each stroke, before the piston reaches the corresponding end of the pump cylinder.

Further objects of the invention will appear hereinafter. y

The invention consists in the novel parts and combinations of parts to be describedl hereinafter, all of which contribute to vproduce an eliicient deep well pump.

A preferred embodiment of the invention is described in the following specification, while the broad scope of the invention is pointed out in the appended claims.

In the drawing:

Figure l is an ideal vertical section through the casing and flow-pipe of a well provided with a pump embodying my 1nvention. This view shows the controlling valve for the pump in its eXtreme low po sition; in this view, parts of the ump are shown partly in elevation and bro en away.

Figure 2 is a view similar to vrFigure 1 but is a section taken on the line 2--2 of Figure l, looking toward the left, certain' parts of the pump, includingthe pump plunger, being shown partially 1n elevation and broken away.A

Figure 3 is a cross-'section through the casing and pump, taken about on'the llne 3f-3 of Figure 1, and particularly illustrat ing the arrangement of the ports or passages through which the liquid being pumped, passes during the operation of the pump.

Figure 4 is a cross-section through the casing and pump taken about on the line 4--4 of Figure 1 and particularly illustrating the construction in the vicinity of the controlling valve. l

Figure is a view similar to Figure 4, but taken at the level of the line 5-5 of Figure 1.

`Figures 6 and 7 are longitudinal sections broken away and illustrating the construction of the full length of the casing of the well, in which connection it should be understood that Figure 7 Shows the apparatus at-a level below the parts shown in Figure 6.

Figure 8 is a vertical section taken through the casing and How-pipe, certain parts being broken away and showing the valve substantially at the upper end of its stroke. y'

Figure 9 is a vertical section similar to Figure 8 but showing the valve in an intermediate position; this view is upon an enlar ed scale. 1 n

igure is a view showing the same parts illustrated in Figure 9, but is a vertical section taken on the line 10-10 of Figure 9, looking toward the left.

In the drawing, 1 represents the usual well casing within which the flow-pipe 2 is located. In applying my invention, I provide means for delivering iuid under pressure at the bottom of the Well. In order to do this I .prefer to provide a packingf head 3 which packs off the upper portion of the casing so as to form an annular rpressure chamber 4 between the casing and the flowlebe pump includes a casing 5, the lower portion of which has a threaded connection with the flow-pipe 2 and the upper portion of which is formed into a pump barrel 6 within which a plunger 7 reciprocates. This plunger is of tubular form, its lower end being slightly enlarged to form a collar 8 which constitutes the head of the plunger. The body 9 of the plunger is of tubular form and extends upwardly from the head 8, and at its upper end is provided with a suitable check valve 10 which may be of the ball ty elllustrated.

In t e operation of the pump, the oil flows upwardly through the bottom head 11 of the barrel and flows through an inner tube or bushing 12, the lower end of which is secured in the Qpening through the bottom head 11 of the pump.

Withi the upper end of the barrel, aA

sleeve 12 is secured, for example, by setvscrews 13, and the annular space 14 between the lower end lof this sleeve and the` head 8 constitutes the cylinder space or" chamber of the pump barrel.

.in an opposite position which will reverse the direction of the movement of the pump plunger.

In order to accomplish this, I provide a tail-rod 16 which extends down through the inner sleeve 12 and through the opening in the lower head 11 of the pump. This tailrod is secured at its upper end in a spider 17 which is carried at the upper end of the plunger. I use a spider at this point so that it will provide ports or openings 18 through r`which the liuid being pumped can pass upwardly in moving past the valve 10.

' The ports which control the operation of the plunger and of the valve 15 are formed inthe wall of pump casing.V

While the valve 15 is thrown automatically toward a reverse position bythe pump plunger at the end of its stroke, I provide means controlled by the pressure in the-pressure chamber 4 to control the, valve 15, further; this prevents stopping of the pump in some intermediate position from which it might fail to start when.the pressure in the pressure chamber 4 was resumed. In the looj operation of the pump the plunger initiates Y the movement of the valve and the fluid pressure completes the movement and holds the -valve in its opposite position. In order to accomplish this I provide the lower end of the valve 15 with an operating piston 19 which has two large heads 20 and 21 connected by a Waist 22 of reduced diameter.

The valve' 15 is also of piston type and includes a lower head 23, an intermediate head 24 and an upper head 2 5.J These heads all co-operate with ports to control the flow of the Huid in the operation of the pump.

In Figure 1, the valve 15 is shown in its extreme low position, at which time the pressure chamber 26 (which forms the upper end ofthe cylinder in which the valve'19 reciprocates), is supplied with iuid underpressure through a port 27 which communicates with the pressure chamber 4. The pressure on the upper end of the head 20 will therefore hold the valve 19 down in its extreme low position.

When the plunger 7 arrives at the end of its upstroke, the tail-rod 16 will pull the valve '15 up toward its elevated position.

In order to accomplish this, I prefer to provide the lower end of the tail-rod 16 with a coil spring 28; during vthis stroke, the upper end of this spring strikes a spider 19'A whlch close this port 27, (see Figure 9), but when this occurs, the liquid within the pressure chamber 26 can flow around a by-pass port 28 around the head 20 and around the waist 22 of the piston 19 so as to escape through an outlet port 29. This portv is in com` munication with a passage 30 that extends upwardly in the wall of the barrel and communicates with the flow-pipe above an upper checkvalve 31 (see Figure 7), located at the upper end of the pump.

As the upward movement of the piston 19 progresses, the lower head 21 eventually uncovers a port 32 which opens communication between the lower pressure'chamber 33 and lthe pressure chamber 4 and admits the fluid under pressure to the under face of the lower head 21. This moves the piston 19 and valve 15 positively up to its extreme upper position.

At the end of the down-stroke of the plunger, the valve 15 and piston 19 are started in their downward movement by a spring 34, (see Figure 1), which is similar to the spring 28 and which seats on shoulder 35 on the tail-rod. This spring 34 strikes against a spider 36 at the upper end of the valve 15 and moves the valve and piston 19 l down until the head 21 closes the lport 32. As soon as this port 32 is closed by the head 21, a by-pass passage 37, similar to the by-pass 28, is opened and this permits the fluid in the chamber 33 to flow around the waist of the piston 19 and through the outlet port 29.

lVhen the piston is moved by the lsprings they have considerable energy stored up 1n them, and it is this energy in the spring which carries the piston and valve pastv the neutral position of the piston when the port communicating with the pressure chamber 14 becomes closed.

When the valve 15 is in its closed position, as indicated in Figure 1, the fluid in the pressure chamber 4 flows in through an inlet port 38 around the lower Waist 39 of the valve through a port 40 in the side of the valve chest and up a pasage 41 which communicates withythe lower pressure chamber 42 of the pump barrel. This forces the pump plunger 7 upwardly, and the spent fluid in the space 14 passes 'out through apassage 43 and through a port 44 into the valve chest where it passes out through an outlet port 45 which communi- Cates with the passage 30 already described. Near the end of the up-stroke of the plunger, the spring 28 initiates the upward movement of the piston 19 which is co-operated with by the fluid pressure of the port 32 to complete the upward movement of the valve 15. .1

In Figure 8, the valve 15 is illustrated in its extreme uppermost position; this connects the parts in a reversed manner. The arrows in that figure indicate that at-this time the upper waist 46 of the valve is in position to permit inward flow of the fluid under pressure through port 47; the fluid, after passing the valve passes up the passage 43 to drive the plunger down, and in this position of the valve, the intermediate head 24 is above the port 45 which places this port in communication with the port 40; this will permit fluid to flow into the valve chamber from `the passage 41 and through the port 45 into the passage 30 through which the fluid passes upwardly so that it is discharged into the flow-pi e 2 above the upper valve 31, (see Figure 7g.

In operation, as shown in Fig. 2, with the plunger at the vlower end of its stroke, the control valve is also in its lowermost position in the valve chamber, and is so held by pressure entering lthrough port 27, so that fluid may enter through port 38 around waist 39 of the valve, and thence through port 40 and passage 41 to the lower end of the power head 8. Thus, plunger 9 is forced upwardly, thereby forcing fluid above the check valve 10 on through the fixed valve 31 to the flow pipe.

On this up-stroke of the plunger 8 the fluid from the power chamber 14 above the head 8 is expelled through passage 43 and port 44 to the valve chamber and around.

the waist of the control valve, and thence through port 45 to passage 30, from which it is discharged into the flow pipe above the valve 31. As plunger 8 nears the end of the upstroke the spring 28 carried on the valve rod 16 engages the control valve and serves to initiate the movement thereof upwardly, thus expelling the fluid from above the power head 2O of the valve through port 27 to the pressure area, and this movement of the plunger and valve continues until the part 23 of the valve laps -port 38 from the pressure area, the portion 24 thereof laps port 45 to the flow p'ipe,and

the portion 20 laps port 27 to the pressure area.

In this intermediate position of the control valve the ports y28 and 37 are in communication with the port 29 .to passa e 30, thereby balancing lthe operation o valve. A further upward movement of the control valve is effected by means of the energy stored up in the spring 28 on the plunger rod. Thus, port 32 to the pressure area is opened and port 37, which permitted communication with the flow pipe is closed.

the

l Fluid under pressure may now enter port 32 below portion 21 of the control valve to move the control valve upwardly to the end of its stroke, in which extreme position the port 38 is lapped by the portion 23 of the valve, and port 47 is open to communication with port 44 and passage 43, so as to permit fluid to flow through said passage under pressure, .to the upper face of the power head 8. The plunger is thereby forced downwardly by pressure and fluid is expelled by the lower face of plunger 8 from chamber 4 2, through passage 41 and port 40 to the valve chamber, around the waist 39 of the control valve, and thence through port 45 into the passage 30, from which it 1s discharged into the flow pipe at a point above the check valve 31.

The downward movement of the plunger continues until the spring 34 carried by the valve rod 16 enga es the upper end of the control valve for orcing said valve downwardly, thereby expelling fluid from the lower face of the power head 21 of said valve through port 32 to the pressure area until port 32 is closed. In this intermediate position of the control valve ports. 27 and 32 are closed and ports 28 and 37 are in communication with ort 29 to passage 30, thereby balancing t e pressures on the valve. The energy in spring 34 thusi acts to further move the valve downwardly, closing port 28 and opening port 27 ,y admitting fluid vunder pressure to the upper face of the power valve through port 27 ,.to force the valve downwardly to the end of its stroke, where it is held in position preparatory to another operation.

The fluid in the well will at all times 'fill the control valve and' plunger 9, and -will rise through valve 10 and 31 into flow i e 2. 1 P t is understood that the embodiment of the invention described herein is .only one of the many embodiments this invention may take,and I do not wish to be limited in the practice of the invention, nor in the claims, to the particular embodiment set forth.

What; I claim is: I

1. In a deep well pump,` the combination of a' well casing with a flow-pipe within the same, a pump barrel connected into fthe flowpipe, said casing being arranged lfor maine taining a pressure zone therewithin and externally of the flow pipe, a connection to the well casing for supplying vfluid under pressure to the pressure zone, a plunger within the pump barrel, check-valves cooperating with the same to enable the plunger to raise liquid, said barrel having ports for opening `communication to the pressure zone, a valve chamber, and passagesconnecting the valve chamber with opposlte portions of the pump barrel, and a control valve below the plunger for controlling the flow of the fluid through said ports and passages, from the pressure zone to both ends of the pump barrel, the fluid pressure operating to move the plunger in opposite directions.

2. In a deep well pump, the combination of a well casing, a flow-pipe within the.l

sure zone, a fixed sleeve within the pumpbarrel communicating at its ends with the flow pipe so as to pass the liquid up through the pump barrel, a tubular plunger telescoping with the fixed sleeve and having a head in the annular space between the wall of vthe barrel and the fixed sleeve, check-valves cooperatingwith the plunger to enable the same to raise liquid, said barrel having ports for opening communication to the pressure zone, a valve for controlling the opening and closing of said ports to `apply pressure to said plunger, means for actuatin the valve by the plunger, and means .permltting the exhaust of the contents of the well through the pump plunger. A l 3. In a deep well pump, the combination of a well casing, a flow-pipe within the same, a pump barrel connected into the lowl plpe, said casing operating as a pressure chamber around the flow pipe, a connection to the wellcasing for supplying fluid under pressure to the pressure chamber, a fixed sleeve within the pump-barrel communicating at its ends with the flow pipe so as to pass the liquid up through the pump barrel, a tubular plunger telescoping with the` fixed sleeve and having ahead in theannular spiace between the wall of the barrel and the xed sleeve, check-valves cooperating with the plunger to enable the same to raise liquid, said. barrel having ports and passages for' opening communication to the pressure chamber and to the barrel, a valve for controlling the opening and closing of y said ports and passages, means for actuatin the valve by the plunger, and by the flui under pressure in the pressure chamber, for controlling the flow of the fluid from the pressure chamber to the pumpbarre1,` and means permitting the exhaust of the con-A tents of the well through the pump lunger. K 4. In a deep well pump, the com ination of a well casing with a flow pipe within the same, a pump barrel connected into the flow pipe, a pressure chamber being maintained within the casing around the flow pipe, a connection to the well casing for supplying fluid under pressure to the pressure chamber, a fixed sleeve within the pump-barrel operatin to pass the liquid-,moving upwardly t rough the pump, a tubular plunlll ger telescoping with the sleeve and having a head to move within the pump barrel, check-valves cooperating with the plunger' to enable the plunger to raise liquid, a valve chamber below the barrel, said valve-chamber having ports leading to it from the pressure chamber and said pump barrel having ports leading to it from the valve chamber, a valve Within the valve chamber, means for controlling the valve by the plunger at the ends of the stroke to enable the valve to control the flow of the fluid from the pressure chamber to the pump barrel, and means for exhausting the contents of the well through the pump plunger.

5. In a deep well pump, the combination of a casing with a flow-pipe within the same, a pump barrel .connected into the flow-pipe, a pressure chamber being maintained within the casing for supplying fluid under pressure to the pressure chamber, a fixed sleeve within the pump barrel operating to pass the liquid upwardly through the same, a tubular plunger telescoped with the sleeve and having a headarranged to move in the ,pump barrel, a fixed cheek-valve carried by the plunger, said pump barrel having a port leading to the flow pipe above `the fixed check valve and having ports for supplying operating fluid to the ends of the pump barrel, a valve-chamber below the pump-barrel, a valve mounted therein for controlling communication between the valve -chamber and the pressure chamber, means for controlling the said valve bythe fluid from the pressure chamber, and means permitting the discharge of the output through and above said plunger into said flow pipe.

6. In a'deep well pump, the combination of a casing with a flow-pipe within the same, a pump casing with `a barrel connected into the ow pipe, a presure chamber within the casing around the flow pipe, a connection to the Well casing for suppl ing fluid under pressure to the pressure c amber, a fixed sleeve Within the pump-barrel operating to pass the liquid upwardly through the same, a tubular plunger telescoped with the sleeve and having a head to move in the pump barrel, ,check-valves cooperating with the plunger to enable the lsame to raise liquid through the flow pipe, a valve chamber and an adJacent pressure chamber within the pump casing below the barrel,y a valve in the valve chamber and a controlling piston for the same in the last named pressure chamber, said plunger having a tail-rod eX- tending down through the said valve and the said piston, with means for engaging the valve to shift the same near the end of the stroke of the plunger, said barrel having ports leading from the valve-chest and ,controlled by the said valve for operating the plunger, said valve-chest having ports communicating with the first named pressure 7. In a deep well pump, the combination of a casing with a flow-pipe within the same,

a pump casing with a barrel connected into the flow-pipe, means for maintaining a pressure chamber within the casing around the flow pipe, a connection to the Well casing for supplying fluid under pressure to the pressure chamber, a plunger mounted to reciprocate within the barrel, check-valves cooperating with the plunger to enable the same to pump liquid through the flow pipe, a valve chamber below the barrel, a piston- Valve mounted to reciprocate-therein having an upper head, a lower head, and an intermediate head with waists between said heads,'said barrel having a port for admitting fluid under pressure from the valve chamber to one end of the pump barrel and another port for admitting fluid under pressure to the other end of the pump barrel from the valve-chest, said pump casing having a pressure chamberwith a piston moving within the same and attached to the piston-valve, and having ports communicating with the first named pressure chamber for controlling the operation of the pistonvalve, said valve-chamber having ports com'- municating with the firstnamed pressure chamber, the said heads ofsaid piston valve cooperating with thelast named ports and the first named ports to-control the flow of the fluid under pressure to the barrel to actuate the plunger, and means permitting the discharge of fluid through said plunger into said flow pipe.

8. In 'a deep well pump, the combination of a casing with aflow-pipe within the I same, a pump casing with a barrel connected into the flow-pipe, means for maintaining a pressure chamber within the casing around the How pipe, a connection to the well casing for supplying fluid under pressure to the pressure chamber, a fixed sleeve within the pump-barrel operating to pass the liquid upwardly through the same, a tubular plunger telescoped with the sleeve and having a head to move in the pump barrel, check-valves cooperating with the plunger to enable the same to raise liquid through the flow pipe, a valve-chamber and an adjacent pressure chamber within the pump casing below the barrel, a valve in the valve chamber and a controlling piston for the same in the last named pressure chamber, said plunger having a tail-rod extendin down through the said valve and the said piston, with means for engaging the valve to shift the same near the end of the stroke of the plunger, said barrel having ports leading from the valve-chest and controlled bythe said valve for operating the J plunger, said valve-chest having ports communicating with the first named pressure chamber and alsorhaving ports for admitting the luid from the first named pressure pump casing with a barrel attached to the flow-pipe, a plunger Within the pump barrel, check-valves cooperating with the same to enable the plunger to raise liquid, a valve chest alined with said barrel co-aXial With the plunger, a valve movable Within the valve-chest, means for conducting fluid under pressure to the valve-chest, said pump casing having ports leading from the valvechest to the barrel to operate the plunger and controlled by the valve a tail rod extended from the` plunger and operating through said valve, compression sprlngs carried on said tail rod and acting against said valve for mechanically initiating the shifting of the valve toward an opposite position by the plunger at the end of a stroke, and fluid operated means cooperating with the valve for completing the movement of the valve to its opposite position and for holding the same therein, 'an exhaust outlet being provided above and on said plunger in communication with theflow pipe.

10. Adeep well pump comprising a 1well casing, a'pump casing depending thereinto and having a barrel on the lower-end thereof, al pressure zone surrounding said barrel and Within said well casing, a control valve and a pump piston arranged in' opposite portions of said barrel, said barrel having means associated with said valve for'regulating the application of pressure to opposite ends of said piston, said pump adapted for` connection with a pressure mechanism for lmaintaining pressure invsaid pressure zone,

and means fordischarging fluid froml the well through said valve and through said piston into said pump casing.

11. A deep .Well pump comprising a Well casing, a pump casing therewithin having a barrel, a plunger and a valve arranged one above the other in axial alinement in said barrel, means for connecting said pump with a pressure mechanism for maintaining an element under pressure in a zone surroundingsaid barrel and within said well casing, said barrel having means cooperatingwith said valve to control the application of pressure to opposite ends of said plunger, an inlet and an outletbeing provided in said barrel for effecting aflow of the liquid pumpedr 12. deep Well pump comprising a Well casing, a pump barrel therein, providing a pressure zone, a flow pipe attached to the upper end of said barrel,al plunger and a valve tandem connected in said barrel, an inlet being provided leading from the casing to said barrel, means for connection with a pressure mechanism for maintaining pressure in said pressure zone, and means associated with \said valve for alternately applying pressure to opposite ends of the plunger, and inlet and outlet means permitting the flow of fluid from the well through said plunger and. said valve.

13. A deep well pump/:omprising an inner and an outer pipe, a pumping mechanism embraced Within the inner pipe, means for connecting a pressure mechanism with vthe outer pipe, a control valve within the inner pipe selectively associated with passages through said inner pipe for applying prestively associated with passages in the inner pipe for regulating the communication between the inner and outer pipes, to direct a pressure element against opposite ends of said plunger, and means for discharging the fluid from the well through said valve and said plunger. to said outlet pipe.

15. A deep well pump comprisingan inner Y outlet pipe, an outer -inlet pipe, a plunger Within the lnner pipe, a pressure element being adapted to be heldk in the outer pi e, means being formed in the inner pipe ihr aiording communication between theinner and outer pipes an inlet and an outlet'being `provided for eil'ecting a llow of fluid from the'well, a control valve operably connected with said plunger and within the inner pipel for controlling communication between said pipes. and the application of said pressure element to said lunger, and means for dis.'- charging fiuid ii'om valve and said plunger.

16. A deep well pum com rising a Well casing, a single pipeA epenv ing thereinto the well through said v forming, a discharge for the Well, a pump i barrel attached thereto .having alined pump and valve chambers arranged for communlcatlon with said casing, an inlet and an outlet for the well fluid, a plunger in the pump chamber, a control valve in the valve chamber, ports and passages being provided in the barrel and adapted for opening and closing by said valve to apply pressure to opposite ends of said plunger alternately, and means extending through said plunger and yieldably connected with said valve for initiating a reverse movement of said valve near the end of each stroke thereof.

17. A deep well pump comprising a well casing, a' single'pipe therein forming a discharge from the well,a barrel attached thereto having an inlet and an outlet for the well Huid, a plunger rod extending through said barrel and provided with a valve at its upper end, a piston in said barrel embracing said rod, a control valve in said barrel below said piston, said barrel having ports and passages therein adapted to be opened and closed by said valve for applying pressure from said casing to opposite ends of said plunger, alternately atV each stroke of the pump, and means'on said rod at the ends of said control valve for initiating the reverse movement thereof near the ends of each stroke of said piston.

18. A deep well pump comprising a well casing, a flow pipe therein having a pump barrel attached thereto, having an inlet and an outlet for the well fluid, separate pump and valve chambers insaid barrel, a piston in the pump chamber, a control valve in the valve chamber, means for connecting a pressure mechanism with and for maintaining a Huid under pressure in said casing, an inlet being provided from said casing to, and for admitting said iuid to, said valve chamber, and passages being provided in said barrel connecting said valve chamber with opposite portions of said 'pump chamber,

` for directing said pressure Huid to and exhausting the same from opposite portions of said piston.

19. A deep well pump comprising a well casing, means for connecting a pressure mechanism therewith for maintaining a fluid under pressure therein, a flow pipe in the casing having a pump barrel 'provided with alined pump and valve chambers, ports being provided for affording communication between said valve chamber and said casing, a hollow piston in said pump chamber, a control valve in said valve chamber lbelow said pump chamber, passages being formed in said barrel for directing pressure from said casing through the valve chamber to opposite ends of said piston, and means for discharging the contents of the well on the 11p-stroke of the piston through said valve chamber into said flow pipe.

20. A deep well pump comprising an inner and an outer pipe, axially alined chambers in the inner pipe, a concentric sleeve in one of said chambers, a pump piston embracing said sleeve, a control valve in the other chamber for regulating communication between the outer pipe and the valve chamber, said outer pipe adapted to contain a pressure medium, ports in said inner ipe for transferring said pressure medium fom the outer pipe to said valve chamber, passages being provided in said inner pipe leading from the valve chamber to and from opposite ends of said piston, the contents of the well being discharged through said sleeve.

21. A deep well pump including a casing and a pump barrel, tandem arranged plunger and valve means in the barrel, said casing adapted to receive a pressure ,element, passages being formed in said barrel and controlled by said valve for transferring said element from the casing to opposite ends of said pump at each stroke of the pump, and means connected with and for discharging the contents of the Well through said valve and said plunger.

22. A deep well pump comprising a well casing, a pump barrel therein having alined pump and valve chambers, a piston and ah control valve in said chambers, respectively, a check valve attached to said piston for controlling the output of the well, a pressure zone between said casing and said barrel, passages being provided through said cont-rol valve and said piston through which the Huid in thewell is elevated, said barrel having passages controlled by the control valve for applying pressure from the pressure zone to `opposite ends of said piston on alternate strokes.

23. In a deep well pump a barrel having alined pump and control valve mechanisms therein, a check valve attached to said plunger for controlling the output of the well, said control valve and said piston arranged to permit the flow of fluid from the well therethrough to said check valve, said barrel having passages therein adapted to be controlled byv said control valve for alternately applying pressure to opposite ends of said piston.

24. A deep well pump comprising abarrel, having an inlet' and an outlet for the well Huid, a pump chamber being provided therein, a valve chamber being provided therein below the pump chamber, a pumping mechanism within the pump chamber, a valve within the valve chamber, means being provided within the pumping mechanism and within the valve to permit a flow of fluid from the well therethrough, passages provided in said barrel communicating with said valve chamber, and adapted to be opened and closed by said valveJ for applying pressure to opposite sides of the pump mechanism.

ros

Signed at Los Angeles, Calif., this 26th 

